2. Relay characteristics of proteins and protein electrophoresis / fractionation.
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1 UNIT: Proteins 15prot_elec.wpd Task Electrophoresis Objectives Upon completion of this exercise, the student will be able to: 1. Review electrophoresis information as presented in class. 2. Relay characteristics of proteins and protein electrophoresis / fractionation. Introduction Plasma contains over one hundred individual proteins, each with a specific set of functions and subject to specific variations in concentration under different physiologic and pathogenic conditions. They interact with virtually all body tissues or cells and they are intimately related to protein metabolism in the liver. Plasma proteins perform a great many physiologic functions. They serve as transport molecules for lipids, hormones, vitamins, and metals. They help maintain osmotic balance and serve as enzymes, complement components protease inhibitors, or kinin precursors. They play an important role in hemostasis (as clotting factors), the regulation of cellular activity and function, and in the defense against infection (immunoglobulins). They contribute to the nitrogen needs of the body. The key roles which plasma proteins play in bodily function, together with the relative ease of assaying them, makes their determination a valuable diagnostic tool as well as a way to monitor clinical progress. Serum proteins have been separated into major fractions or groups for quite some time using solubility principles ( salting out and ultracentrifugation techniques separating fractions (4.5s, 7s and 19s) based on molecular weight. Moving boundary or free electrophoresis employing a fluid medium for protein separation was first introduced by Tiselius in He was able to resolve proteins into four major bands designated albumin, alpha, beta, and gamma globulin. With the introduction of filter paper electrophoresis by Konig in 1937, the use of electrophoresis determinations became practical. The greater resolution of the method yielded five major fractions. Procedures Principle The introduction of cellulose acetate in 1958 by Kohn made possible much more rapid analysis using a small sample volume. Other advantages of cellulose acetate over paper as a support media are its great tensile strength when wet, its almost pure and relatively uniform structure, minimal sample absorption, and its low affinity for dyes. Cellulose acetate also may be rendered almost crystal clear for easier quantitation. Agarose gels and polyacrylamide gels have become increasingly popular. MLAB Clinical Chemistry Lab Manual H 131
2 Electrophoresis is best used as a screening technique. Abnormalities may be further identified and evaluated by one of the immunological techniques. The principle of electrophoresis is based on the fact that a charged particle placed in an electrical field will migrate toward one of the electrodes of the field depending on the electrical charge on the particle size of the particle strength of the electrical field nature of the medium used to support the particle during the migration process The following lists would be applicable for protein electrophoresis using cellulose acetate as the support medium. Supplies and Equipment 1. applicator 5. chamber and wicks 2. sample well plate 6. staining set 3. aligning base 7. evaporation hood 4. cellulose acetate support medium 8. densitometer Reagents 1. Barbitol Buffer ph Ponceau S stain 3. 5% acetic acid 4. Clearing solution: 125 ml of reagent grade methanol plus 50 ml DI water Specimens 1. Fresh unhemolyzed serum is the specimen of choice. Plasma can be used but an extra peak will appear in the beta zone. 2. Urine can be used, but usually concentration procedures must be done to assure the presence of protein in adequate amounts. 3. CSF specimen. Concentration may be required. Results 1. Relative Position of the Protein Fractions The fastest moving band, and normally the most prominent, is the albumin band found closest to the anodic edge of the plate. The faint band next to this is Alpha 1 Globulin, followed by Alpha Globulin, Beta and Gamma Globulins. 2 H 132 MLAB Cliinical Chemistry Lab Manual
3 2. Calculations Calculate from the integrator scale on the scan the relative percent of the various fractions in the sample. Determine the total protein in the sample in grams per deciliter by a standard laboratory method. Multiply the relative percent of each band times the total protein value. Divide this by 100. The result is the value in grams per deciliter for the various fraction. Example: Total Protein = 8.2 gms/dl Albumin = 59% (59/100) x 8.2 = 4.8 gms/dl Alpha 1 = 5% (5/100) x 8.2 = 0.3 gms/dl Alpha 2 = 8% (8/100) x 8.2 = 0.7 gms/dl Beta = 10% (10/100) x 8.2 = 0.8 gms/dl Gamma = 19% (19/100) x 8.2 = 1.6 gms/dl Relative percent and grams per deciliter may be computed automatically using a computer accessory with the densitometer. Expected Values The expected values for serum protein electrophoresis on cellulose acetate stained with Ponceau S were determined from an in-house study of 51 normal subjects. These values are for illustrative purposes only. Each laboratory should establish its own range. Mean (gm/dl) S.D. Range (+2 S.D.) Albumin gm/dl Alpha gm/dl Alpha gm/dl Beta gm/dl Gamma gm/dl MLAB Clinical Chemistry Lab Manual H 133
4 Interpretation of Patterns Below is a normal serum protein graph showing the location of some of the more commonly known proteins. Record Your Results Total Albumin Alpha 1 Alpha 2 Beta Gamma H 134 MLAB Cliinical Chemistry Lab Manual
5 Study Questions Name Date Instructions: Based on information presented in lecture and lab notes, answer the following questions. Legibly write your answers in the space provided. Unless otherwise indicated, each question is worth one point. 1. What is the charge of a cathode? Anode? 2. Which ions travel toward the anode? The cathode? 3. What property of proteins in the buffer makes electrophoresis possible? 4. Identify the buffer referred to in the previous question. What is its ph? 5. List four (4) variables that affect electrophoretic separation of proteins. (½ point each) a. b. c. d. 6. Identify the five (5) major protein classes, listing them in order of migration from the anode to the cathode. 7. The introduction of moving boundary technique of electrophoresis is credited to 8. List two (2) support mediums, other than cellulose acetate, that have been used in moving boundary electrophoresis. 9. List two (2) methods, other than electrophoresis, that have been used to separate proteins into fractions. 10. Briefly explain electroendosmosis. MLAB Clinical Chemistry Lab Manual H 135
6 11. Which protein fraction is most affected by it? 12. Why is this fraction influenced by electroendomosis? 13. The lab says that a plasma can be used for electrophoresis, but an extra peak will be detected. What would cause this extra protein peak to occur in electrophoresed normal plasmas? 14. Calculate the concentration in gm/dl for each electrophoretic fraction of a specimen having a total protein of 6.4 gm/dl with 47% albumin, 4% alpha 1, 9% alpha 2, 11% beta, and 29% gamma. H 136 MLAB Cliinical Chemistry Lab Manual
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